We have a lot of people on a Trello board used to submit design requests, so often you would be a member of only 1-2 out of 20+ cards. We have 1 slack channel for each person's notifications so they can customize them. I set up my slack notifications, but it notifies me about the comments from every card from every person on the board.
Can I configure these to only alert you only if you're a member of that card and/or only if you are @mentioned? Having a constant stream of notifications about all the 20+ projects you're not a part of kinda defeats the whole purpose.